Back-rest for machine-seats.



E. JOHNSON.

BACK BEST FOR MACHINE SEATS.

APPLICATION 111.1111 JAN. 10, 1911.

1,000,814. Patented Au 15, 1911.

ELMEE JOHNSON, or AXTELL, NEBRASKA.

BACK-REST FOR MACHINE-SEATS.

Specification of Letters Patent.

Patented Aug. 15, 1911.

Application filed January 10, 1911. Serial No. 601,826.

To all whom it may concern:

Be it known that I, ELMER JOHNSON, a citizen of the United States, residing at Axtell, in the county of Kearney and State of Nebraska, have invented new and useful Improvements in Back-Rests for Machine- Seats, of which the following is a specification.

This invention relates to back rests for, machine seats and the object of the invention is to provide a back rest which may be easily and conveniently secured to the seat spring of the vehicle and which may be adjusted to accommodate the device to the user.

A further object of the invention is the provision of a device of this character which is simple and efficient and which may be constructed so as to be placed upon the market at a relatively small cost.

Further objects of the invention will appear as the following specific description is read in connection with the accompanying drawing, which forms a part of the application, and in which Figure 1 is a perspective View showing the device attached to a seat spring. Fig. 2 is a horizontal section taken on the line 22 of Fig. 1. Fig. 3 is a similar section on the line 3-3 of Fig. 1. Fig. 4 is a detail perspective view of a modified form looking from the rear thereof. Fig. 5 is a detail section through the seat and seat spring showing how the back may be adjusted.

Referring more particularly to the drawing, 1 represents the seat spring, 2 the ordinary pressed steel or cast seat and 3 the seat bolt. The back rest attachment comprises a strip of spring metal 4 which is provided at one end with a plurality of apertures 5 through which the seat bolt 3 is adapted to pass to secure the strip in position. The opposite end of the strip 4 has its ends bent at right angles and the terminating portion is bent into a flange 6 which extends parallel with the main body portion of the strip and is provided with a pair of apertures 7 which are adapted to register or aline with similar apertures 8 formed at the juncture of the main body portion of the strip and the right angular portion.

The back frame is formed of a single strand of heavy spring wire 9 whose terminal ends are bent into parallelism and adapted to pass through the apertures 7 and 8 and be held in position therein by a bolt and washer 10. The washer is grooved on its rear side, as at 11, to receive the parallel legs, which construction prevents the washer from turning, and more firmly holds the legs in position. These legs diverge at 12 for a short distance and then extend upwardly on parallel lines, as at 13, and are connected together at their upper ends by the rearwardly bowed back piece 14. Stretched across the frame 9 and sewed or otherwise connect-ed to the parallel portions 13 is a back rest 15 which may be constructed of any suitable material, such as a water-proof canvas or the like.

In the modification shown in Fig. 4 the strip 16 is bent at right angles at one end, as at 17 and its terminal end is bent parallel to the main body portion and extends rearwardly from the strip. This terminal portion is apertured, as at 18, to receive the legs of the back frame and the legs are secured in position, as shown in Fig. 1.

In the use of this structure it will be noted that the adjusting holes 5 permit the back to be adjusted as far away or as close to the seat as is found to be desirable and that the length of the legs of the back frame readily permit adjustment thereof so as to accommodate the device for tall or short persons. The strip 4 being resilient and the back piece 15 being flexible makes the rest a very comfortable and easy one.

Having thus described the invention, what I claim as new is 1. In a device of the class described, the combination with a seat spring and a seat thereon, of a spring bar arranged beneath the seat, means to adjustably secure the same to said seat spring, and a seat back adjustably mounted in the bar. v

2. In a device of the class described, the combination with a seat spring having a seat thereon, of a spring bar, means for adjustably securing the same to the seat spring, a seat back frame adjustably mounted on said bar and including sides, and a flexible back rest stretched between the sides of the frame.

3. In a device of the class described, the combination with a seat support and a seat thereon, of a spring bar, means for adjustably securing the spring bar to the support beneaththe seat, a seat back frame adjustably mounted upon said bar and including sides, and a flexible back rest stretched between the sides of the frame.

4. In a device of the class described, the

combination With a seat spring, of a seat thereon, a fiat spring bar having a plurality of apertures therein, means for engaging said apertures to adjustably secure the spring bar to the seat spring beneath the seat, one end of said bar being bent at right angles, a one-piece back frame having parallel terminal legs and sides, means for vadjustably holding said legs along the right angular portion of said bar, and a flexible back rest stretchedbetween the sides of said frame.

5. In a device of the class described, the combination with a seat spring and a seat thereon, of a fiat spring metal strip having a plurality of apertures therein, means passing through the apertures for adjustably securing the strip to the seat spring beneath the seat, one end of said strip being bent at right angles, the terminal ends of said right angular portion having apertures therein, a single back piece frame including sides and having parallel terminal legs slidably mounted in said apertures and lying against said right angular portion, and means to adjustably secure. said legs against the right angular portion, together With a flexible back rest stretched between the sides of the frame.

In testimony whereof I afiix my signature Witnesses: I

JOHN lVYoKorF, O. H. JoHNsoN.

Copies of this patent may be obtained. for five cents each, by addressing the- Commissioner of Patents. Washington, D. C. 

